JPH03620Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a solenoid valve, and more particularly, to an electromagnetic valve that limits a passage cross section to a small value at the initial stage of operation and secures a large passage cross section after a predetermined period of time has elapsed.

BACKGROUND TECHNOLOGY When igniting a gas burner such as a large water heater or a factory boiler, a large ignition noise is produced when a large amount of gas flows through the ignition. Furthermore, if proper ignition cannot be achieved after one or several ignition operations, the appliance may be damaged by the explosion impact upon ignition.

From this point of view, the gas flow rate during ignition operation,
In other words, flow control is required that limits the gas flow rate to a small value at the beginning of the electromagnetic valve opening operation and increases the flow rate after a predetermined period of time has elapsed.

Conventionally, in order to perform the above-mentioned flow rate control, two passages with different cross-sections were provided, each with a solenoid valve, and at the beginning of operation, the solenoid valve in the small passage was opened to allow a small amount of gas to flow through. Release it and perform the ignition operation,
The first control method opens the solenoid valve in the large passage after a predetermined period of time to achieve combustion at a predetermined flow rate, and the first control method involves interposing one solenoid valve in one passage and controlling the degree of opening of this solenoid valve using electronic proportionality. A second control method is known, which is regulated by control.

Problems that the invention aims to solve However, the first control method described above requires a complicated piping system, requires two solenoid valves, which increases the number of parts, and is large, resulting in space constraints. , and has problems such as high cost.

Further, although the second control method can simplify the piping system, reduce the number of parts, and reduce the size, it has the drawback of being extremely expensive.

This invention was made in order to solve the above-mentioned conventional problems, and aims to provide a solenoid valve that can simplify the structure, reduce the number of parts, and reduce the size, as well as reduce the price. purpose.

Means for Solving the Problems The solenoid valve according to this invention includes a main valve body that is disposed opposite to a valve seat in a valve box and has an orifice formed therein, and an auxiliary valve body that is disposed opposite to the orifice of the main valve body. , a valve stem having the main valve body fixed thereon and the auxiliary valve body being slidably fitted on the outside thereof, the valve stem being interposed between one end of the valve stem and the auxiliary valve body to separate the two; and a small spring that biases the main valve element toward the valve seat side, an electromagnet that operates the auxiliary valve element, and an auxiliary valve element that is interposed between the electromagnet and the auxiliary valve element to overcome the small spring. a large spring that contacts the main valve body and closes the orifice; and an actuator that is disposed on the other end of the valve rod and operates the main valve body, and a valve seat is attached to the rod member of the actuator. A communication passage is provided that communicates the inside of the downstream valve box with the inside of the actuator, and when the auxiliary valve body is opened by the excitation of the electromagnet, the main valve is controlled by the fluid pressure introduced from the passage into the actuator. When the main valve body is opened, the main valve body is opened by fluid pressure introduced from the passage into the actuator.

Function In this invention, the auxiliary valve element opens by energizing the electromagnet, opens the orifice of the main valve element, and opens a passage with a small cross section. Next, the actuator is actuated by the fluid pressure introduced through the communication passage, the main valve body is opened, the valve seat is opened, and the passage having a large cross section is opened.

Embodiment FIG. 1 is a longitudinal sectional front view showing an embodiment of this invention, in which 1 is a valve box, 2 is a main valve body, 3 is an auxiliary valve body, 4 is a valve stem, 5 is an actuator, and 6 is a valve body. Showing an electromagnet.

The valve box 1 has an inlet 1A on one side and an outlet 1B on the other side, and forms a valve seat 1C in the center.

The main valve body 2 is fixed to the lower end of the valve stem 4 and the valve seat 1C
A plurality of orifices 7 are formed.

The auxiliary valve body 3 has a bobbin 6 with an electromagnet 6 at its upper part.
A, and the lower part is slidably fitted onto the valve stem 4. A small spring 11 is interposed between the valve stem 4 and the auxiliary valve body 3 to separate them 3 and 4 and urge the main valve body 2 toward the valve seat 1C.

A large spring 8 is interposed between the auxiliary valve body 3 and the iron core 6C of the electromagnet 6, and the spring force of the large spring 8 is set to be larger than the spring force of the small spring 11. Therefore, the lower end annular peripheral wall portion of the auxiliary valve body 3 overcomes the bias of the small spring 11 due to the bias of the large spring 8 and is brought into a closed state where it contacts the upper surface of the main valve body 2, that is, the orifice 7 is closed. maintained in the state.

In this embodiment, the actuator 5 is constituted by a diaphragm device, and is attached to the lower surface of the valve body 1 concentrically with the main valve body 2, the auxiliary valve body 3, and the valve stem 4. It is partitioned into an upper chamber 5C and a lower chamber 5B by a diaphragm 5A, and has a rod member 13 that passes through the diaphragm 5A and is connected to it with a screw.
A spring 5D is interposed in the upper chamber 5C.

The upwardly protruding portion of the rod member 13 is slidably fitted into the valve body 1. Therefore, the communication path 10
The downstream side of the valve seat 1C in the valve body 1 and the lower chamber 5B of the actuator 5 communicate with each other via the valve body 1. Further, the upper chamber 5C communicates with the atmosphere via the hole 5a. In the figure, 6B indicates an electromagnetic coil, and 9 indicates a seal member.

Next, the operation of the above configuration will be explained.

When the electromagnetic coil 6B of the electromagnet 6 is excited, the auxiliary valve body 3 is attracted to the iron core 6C as shown by the imaginary line X to open the valve against the spring force of the large spring 8, and the main valve body No. 2 orifice 7 is opened. Therefore, a small amount of fluid (for example, gas) passes through the orifice 7 with a small passage cross-sectional area and enters the outlet 1.
It is derived from B.

In this way, even if the auxiliary valve body 3 is opened, the main valve body 2 is held against the valve seat 1C by the spring force of the small spring 11.
has been closed.

On the other hand, at the same time as the auxiliary valve body 3 is opened, fluid flows into the communication passage 10 and is discharged from there into the lower chamber 5B of the actuator 5, thereby gradually increasing the pressure in the lower chamber 5B.

After a predetermined period of time has elapsed, the pressure in the lower chamber 5B overcomes the spring force of the spring 5D to push up the diaphragm 5A, and the rod member 13 pushes up the valve stem 4 and main valve body 2 to open the valve seat 1C. Therefore, a large amount of fluid passes through the inner periphery of the valve seat 1C, which has a large passage cross-sectional area, and is led out from the outlet 1B.

In this way, for example, by performing the ignition operation between the time when the auxiliary valve body 3 is opened and the main valve body 2 is opened, it is possible to prevent the occurrence of a loud ignition sound or damage to the appliance due to the explosion impact at the time of ignition. etc. can be prevented.

Note that from the time when the auxiliary valve body 3 is opened and the orifice 7 is opened, the main valve body 2 is raised and the valve seat 1 is opened.
The response time until C is released is spring 5D.
spring constant, passage cross-sectional area of communication passage 10, and hole 5
It can be arbitrarily adjusted by changing the hole diameter of a.

Effects of the invention As explained above, according to this invention, the auxiliary valve element is opened at the initial stage of operation, and after a small amount of fluid passes through the orifice formed in the main valve element, the passing fluid is A part of the fluid is introduced from the communication path into the actuator to operate the actuator, which opens the main valve body and allows a large amount of fluid to pass through. It has advantages such as a simplified structure, smaller size, and lower cost.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view showing an embodiment of this invention. 1... Valve box, 1C... Valve seat, 2... Main valve body, 3
... Auxiliary valve body, 4 ... Valve stem, 5 ... Actuator, 6 ... Electromagnet, 7 ... Orifice, 8 ... Large spring, 10 ... Communication path, 11 ... Small spring, 13 ... Rod member .

Claims (1)

[Scope of utility model registration request] A main valve body is provided opposite to the valve seat in the valve box and has an orifice formed therein, an auxiliary valve body is provided opposite to the orifice of the main valve body, and the main valve body is fixed, and the auxiliary valve body is slidable. a small spring having a movably fitted valve stem, which is interposed between one end of the valve stem and the auxiliary valve body to separate the two and urge the main valve body toward the valve seat; an electromagnet that operates the auxiliary valve body;
a large spring interposed between the electromagnet and the auxiliary valve body to overcome the small spring and bring the auxiliary valve body into contact with the main valve body to close the orifice; and a large spring disposed at the other end of the valve stem. and an actuator for operating the main valve body, and a communication path is provided in the rod member of the actuator to communicate the inside of the valve box on the downstream side of the valve seat with the inside of the actuator, and the auxiliary valve body is actuated by the excitation of the electromagnet. When the valve was opened,
A solenoid valve characterized in that the main valve body is configured to be opened by fluid pressure introduced from the communication path to an actuator.